September weather forecastCooke City, MT
September
Weather in September
September brings visible changes to Cooke City's weather, as temperatures start tapering off from the summer heat. A substantial decrease in sunshine hours gives an early indication of the impending fall. The city experiences snowfall again after the summer hiatus, a modest 1.54" (39mm), marking a shift from the heat. Natural vistas undergo a transformation, with leaves changing hues, adding a touch of mystique. As the city witnesses cooler evenings and warmer days, the transition season makes September a treat for nature lovers.Temperature
In the transition to September, Cooke City observes a minor drop in the average high-temperature, shifting from a moderately hot 77°F (25°C) in August to a pleasant 68.7°F (20.4°C). Cooke City reports an average nighttime low-temperature of 48°F (8.9°C) in September.Humidity
In September, the average relative humidity in Cooke City is 47%.Rainfall
In Cooke City, Montana, during September, the rain falls for 9.3 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, in Cooke City, there are 138.8 rainfall days, and 16.14" (410mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 1.5 snowfall days, it receives 1.54" (39mm) of snow. Throughout the year, there are 92.3 snowfall days, and 55.83" (1418mm) of snow is accumulated.Daylight
In September, the average length of the day in Cooke City is 12h and 31min.On the first day of the month, sunrise is at 6:42 am and sunset at 7:56 pm. On the last day of September, in Cooke City, sunrise is at 7:17 am and sunset at 7:01 pm MDT.
Sunshine
In Cooke City, the average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index in Cooke City is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Adopt protective measures - It is advised to guard against sun damage. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cooke City, MT
- Average high temperature in September: 68.7°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is December (27.5°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is July (56.1°F).
The coldest months (with the lowest average low temperature) are February and December (14.9°F).
Average pressure in September
Cooke City, MT
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in September
Cooke City, MT
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is January (7.9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in September
Cooke City, MT
- Average humidity in September: 47%
The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is August (43%).
Average rainfall in September
Cooke City, MT
- Average rainfall in September: 0.98"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in September
Cooke City, MT
- Average rainfall days in September: 9.3 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is November (5.7 days).
Average snowfall in September
Cooke City, MT
- Average snowfall in September: 1.54"
The month with the highest snowfall is April (9.37").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Cooke City, MT
- Average snowfall days in September: 1.5 days
The month with the highest number of snowfall days is February (14.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Cooke City, MT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).
Average sunshine days in September
Cooke City, MT
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is December (17.4 days).
The month with the least sunshine days is May (5.1 days).
Average UV index in September
Cooke City, MT
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Cooke City, MT
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 36).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in September
Cooke City, MT
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
